using tie-to

Hey all,

I'm trying to fit the spectral continuum with two different xspec models: 
phabs and pfcabs. Both of these models have as a constraint the hydrogen 
density. What I would like to do is tie these two parameters together since 
they should always be the same, but I don't know if that's possible. I know 
set_par lets you freeze variables, so is there any way I can tie these two 
variables together?


Thanks,
Bert Pablo

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